toJson method
Implementation
@override
Map<String, dynamic> toJson() => <String, dynamic>{
'creator_id': creatorId?.toJson(),
'creation_date': creationDate,
'is_from_giveaway': isFromGiveaway,
'giveaway_message_id': giveawayMessageId,
'month_count': monthCount,
'day_count': dayCount,
'user_id': userId,
'use_date': useDate,
'@type': constructor,
};